diff --git a/README.rst b/README.rst
index 39cf5015..49eca8ca 100644
--- a/README.rst
+++ b/README.rst
@@ -156,8 +156,8 @@ sysc
 sysc is the (current) last 'system' of live-bootstrap. This is a continuation
 from sysb, executed through util-linux's ``switch_root`` command which moves
 the entire rootfs without a reboot. Every package from here on out is compiled
-under this system, taking binaries from sysa. Chroot mode skips sysb, as it
-is obviously irrelevant for a chroot.
+under this system, taking binaries from sysa. Chroot and bubblewrap modes skip
+sysb, as it is obviously irrelevant to them.
 
 Python-less build
 -----------------
diff --git a/rootfs.py b/rootfs.py
index 70485477..82729fd0 100755
--- a/rootfs.py
+++ b/rootfs.py
@@ -104,9 +104,10 @@ def main():
         return count
 
     if check_types() > 1:
-        raise ValueError("No more than one of qemu, chroot, minikernel, bare metal may be used.")
+        raise ValueError("No more than one of qemu, chroot, bwrap, minikernel, bare metal "
+                         "may be used.")
     if check_types() == 0:
-        raise ValueError("One of qemu, chroot, minikernel or bare metal must be selected.")
+        raise ValueError("One of qemu, chroot, bwrap, minikernel or bare metal must be selected.")
 
     if args.bare_metal:
         args.no_create_config = True